Problem set 3 -week 3 challenge: Anti-roll bar optimization

1.Calculate the following geometric parameters:   i.Caster=5.38 deg ii.Mechanical trail=9.41 mm iii.Kingpin inclination angle=10.1 deg iv.Scrub radius=32.35 mm v.Kingpin lateral offset or spindle length=85.29 mm 2. Calculating the restoring moment Moment arm is the sum of mechanical trail and pneumatic trail. Mechanical…

Since this project is a litte complex, I want to explain everything step by step. 1- Firstly I opened the front SLA  and the rear multilink suspension and arrange the setup parameters according to the values that is given us for this project. For Front Suspension <!--[endif]--> For Rear Suspension<!--[endif]-->…

I opened the multilink suspension system. These parameters must be determine; 1-Brake Steer: Because of the braking force, wheels will create an Moment which causes to steer. Since the braking force is more in front wheel, the wheel will steer more than the rear wheel and this will cause an understeer or oversteer effect.…

Work Flow 1-Caster Angle 2-Caster Moment Arm 3-KPI Angle 4-Steer axis offset 5-Steer axis Long. offset 6-Scrub Radius Firstly the suspension model is opened and runned I parallel wheel travel simulation. According to this simulation; 1- Caster Angle=5.36 (deg) Caster angle is the inclination of the steering axis in the…

Firstly I opened the assembly and run a parallel wheel travel simulation. Then I opened the post processing and plot the camber angle vs wheel travel. Then I changed the hardpoint of the UCA front of z direction to see the differences of camber gain.  ----------------------------------------------------------------------------------------------------------…

1) Firstly I opened the double wishbone and steering system as a template and saves this templates to my private database so the orginal templates will not chane. 2) Then I clicked a new subsystem and openden these two templates. saved in my private database again as subsytem. 3) I  saved these new subsystem to my…

Work Flow 1) I calculate the Wheel rate and the ride rate with the given parameters. 2) Then I calculate the sprung and unsprung mass natural frequency. 3) With the ride rates I could calculate the critical damping for sprung and unsprung mass 4) The I could calculate the Damping Coeff. due to the critical damping. 5)…

Work Flow 1) Firstly I calculated the sprung and unsprung mass of each wheel. 2) Then I set a spring stiffness value to determine the ride rates. 3) I calculate the front nautral  frequency according to the target value. 4) Then I calculate the suitabel rear natural frequency due to the time lag. Note: In my exceel tool,…

Roll Gradient 1) Firstly I determined some parameters like Roll Moment arm, Roll Moment, Total Roll stiffness with the given input parameters. 2) I calculate the Total lateral load transfer, lateral load transfer forum unsprung mass and also for sprung mass to determine the lateral load transfer due to roll. 3) With the…

difference between wheel rate and spring rate is the wheel rate is what the driver feels and the tires deal with while driving 2) İt is nearly the same but in ride rate the vertical displacement is between the contact patch and the from sprung mass but for wheel rate it is from wheel center. 3)  a) To reduce the transibilty…

Defined coordinates İnstant center (-850.99,239.11) or  (850.99,239.11) Roll center (800.00,-224.78)  The roll center high is then 224,78 mm I send also I picture to see how I define this values.

I  made I calculations on MATLAB

I answered the question 1,2,3,4,5,6 . 7. Because we considered  just the 2DOF model , so the suspension sistem and other important components which effects the understeer gradient are not included.

1) Here to calculate the Roll Moment I consider the lateral g (Ay=1) because there was no value for this. I firstly calculate the lateral and gravity component. The gravity component has a small effect for roll because we multiply the gravity equation with sin(a) where (a) is the roll angle. Since the roll angle is small…

1) For the first question I calculate the deflection at front and rear spring by calculating the wheel rate and the load transfer. By using these values I calculated simply the deflection. After I determined the deflections, I summed these values and diveded by the wheelbase to determine the pitch angle. With the pitch…